Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b1543a9c1a4374…

MALICIOUS

PDF

43.4 KB Created: 2020-09-30 07:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9d2f05378ea8f79173a1557436948428 SHA-1: 273fb0a881c0b6da6bc60643650ac8668f3fbf38 SHA-256: 15b1543a9c1a4374f4b4c8638c9a44dbf50b1ea1fe0b465fe6386fb1598ddc2a
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=learn+numbers+in+spanish+pdf In PDF document text
    • https://site-1036671.mozfiles.com/files/1036671/20224313619.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/98118193511.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/polepuwuxejilezokem.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/92354374309.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/22937517700.pdfIn PDF document text
    • http://files.sussexflowinitiative.org/uploads/1/3/0/8/130814666/73618f45d42a598.pdfIn PDF document text
    • http://rarejasud.tauntonwomensaid.org.uk/uploads/1/3/0/7/130775451/divotupugeragop.pdfIn PDF document text
    • http://files.vergelearning.com/uploads/1/3/1/8/131871642/nukurizogaxuku-debapo.pdfIn PDF document text
    • http://zisig.boafboutique.com/uploads/1/3/0/9/130969265/zalemesoxof-mubagofumaf-disomimu.pdfIn PDF document text
    • http://files.kittykendall.com/uploads/1/3/2/7/132740541/4e97962cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6090/3582/files/90250405957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/39627227874.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/brahui_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8879/8111/files/vanelamopaderatatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5387/4329/files/45547646887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/abhimanyudu_movie_audio_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/92065925422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8121/8710/files/resurrection_home_page.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A49 5328 bytes
SHA-256: 8a14abaf03dff2512a578c6930fe0a26bbc6b2fa219605a2507d707f82711fed
font_01_sfnt_off00007c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C39 10552 bytes
SHA-256: 0953487ec19ba1a51b32002640042def47b873e2efb869926cc8dac2881d370d

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